Originally Posted by
Natalka
That's odd that she would try to mount him, it's unusual... usually it's just the rolling around and howling!
Anyway, don't worry, she's not in pain or anything, it's just the cycle she's in - hopefully she won't be really loud for you! Give her an all-over rub when she gets to flipping around from side to side, that might help her a bit.
How old is she? If you wanted her spayed it should have been done before her first heat cycle, which can be as early as four months old.